Spark plug part numbers and gap size?

nadrojcote · March 26, 2015

Does anyone know the part number for spark plugs on a 2014 5.3l? I am going to replace mine and would also need the gap size info.

newdude · March 26, 2015

Owners manual has the part#... 12622441.

Plug gap is 0.037–0.043 in. The OEM plugs come pre-gapped (most likely at .040 in).

Edited March 26, 2015 by 15HDriver

nadrojcote · March 26, 2015

Thanks I didn't even think to check the owners manual, I figured they would be in the service manual.

Crf450r420 · March 27, 2015

There is a coating on the factory iridium plus you mess up if you gap them so don't

07Softail · March 28, 2015

There is a coating on the factory iridium plus you mess up if you gap them so don't

If you gap plugs properly you won't disturb the Iridium on the center and ground electrode. Key is PROPER! And if you don't know how... do some research.

RT

Edited March 28, 2015 by 07Softail

Spurshot · March 28, 2015

I'm curious why you are changing plugs. Have you already reached the recommended interval? Or is there a problem?

redwngr · March 28, 2015

I'm curious about the reason for change as well.

Crf450r420 · March 28, 2015

The coating is on the ground strap so there is no way to gap it without messing it up. The Iridium tip lasts because of the metal the coating is so the rest of the plug lasts the 100,000 miles.

Edited March 28, 2015 by Crf450r420

07Softail · March 29, 2015

The coating is on the ground strap so there is no way to gap it without messing it up. The Iridium tip lasts because of the metal the coating is so the rest of the plug lasts the 100,000 miles.

BS! Let me guess you probably pry between the Ground Strap and The Center electrode if so that is incorrect!!

RT

Spurshot · March 29, 2015

I found this on Denso plugs. Couldn't find any specific info on the ACD iridium plugs about gapping them. But the Vette forum guys all gap them.

07Softail · March 29, 2015

I found this on Denso plugs. Couldn't find any specific info on the ACD iridium plugs about gapping them. But the Vette forum guys all gap them.

Thanks...This is the correct way! I have an Old AC gap tool that has a notch cut out on the end for bending the grounding electrode loose or tight which is the PROPER way of gaping plugs...way before all of these fancy plugs came out.

RT

Crf450r420 · March 29, 2015

I'm going off our GM parts vender, but maybe his years of experiance are wrong. He is good guy and know his shuff, not that he can't be wrong. However he is not with out experiance. Not like GM tells them everything so they all learn it a little at a time.

Spurshot · March 29, 2015

I wouldn't use one of these to open the gap.

Nor one of these to close it.

Edited March 29, 2015 by spurshot

Crf450r420 · March 29, 2015

I'd love to have one of those jacobs gappers for testing and racing with full straps. The disk is a joke, right?

nadrojcote · March 29, 2015

I have 74,000km and my previous vehicles recommended changining after 100,000. I like to do maintenance before it's recommended. Plus, then I can share my experience with other.